This is a tender perennial best grown as an annual in most parts of the U.S. It is hardy to Zone 10. A member of the oregano family, sweet marjoram and oregano are often confused, but their flavors are different.
Sweet marjoram can be very susceptible to damping off and can be difficult to grow from seed. You may want to purchase started plants. Place plants in full sun in a well-drained location.
Once established, leaves should be taken randomly rather than shearing the growing tips. When frost time nears, plants can be potted up and taken indoors for a few months.
Sweet marjoram dries easily on screens in the shade. Once dried, finish the drying in a 100 degree F or lower temperature oven to crisp the leaves. Remove leaves from the stems and store in jars.
Sweet marjoram can be used fresh in omelets, mixed with fresh vegetables, and added to casseroles.